Nothing here is sponsored. No affiliate links, no paid placements, no partnerships — these are simply the apps we'd point a friend towards. One of them is ours, and we've tried to describe it as plainly as the rest.
Why this order
Most "sustainable shopping" advice starts with what to buy. That's the wrong end. The waste hierarchy — the framework behind most environmental policy — puts prevention above reuse, reuse above recycling, and recycling above disposal. Applied to clothes, that means the wardrobe you already have beats every purchase, however well-intentioned.
So the apps below run lowest-impact first. Wearing what you own requires no new garment to exist. Renting and reselling keep existing garments in use. Researching a brand only matters once you've genuinely decided you need something new — which, done properly, is rarer than the industry would like.
1 · Rewear what you own
Closet Remix
closetremix.co.ukOurs, so read it with that in mind. Closet Remix styles outfits from the clothes already in your wardrobe — no shop, nothing to buy. You photograph what you own once, and it builds looks around your colour season and the shapes that suit you.
What it does, in short:
- Daily outfits from your own wardrobe, planned across morning, day and evening, and aware of the weather.
- Remix Studio — a drag-and-drop flat-lay canvas for building and saving looks before an occasion.
- Capsule Builder — 15, 25 and 33-piece capsules picked from what you already have.
- Colour analysis — a twelve-season quiz, on-device, retakeable, plus a printable palette card.
- Cost-per-wear and impact per garment, updating each time you log a wear.
- Item stories — where a piece came from and what it means, kept with the piece.
- Smart Shop — before you buy, check it against what you already own.
- Brand directory — 60+ researched brands, free on every plan.
Your wardrobe and photos stay on your device — we don't upload them. Free tier, no time limit; Premium is £7.99 a month with a 30-day trial. Built by Fashion Fusion CIC, a community interest company in Doncaster.
Who it's for Anyone who owns more clothes than they wear — which is most of us.
Whatever you use for this — a spreadsheet, a phone album, us — the habit is what matters. Nearly every wardrobe contains outfits nobody has thought of yet.
2 · Rent for occasions
The wedding, the interview, the black-tie thing. Occasion pieces are the worst value in any wardrobe — high cost, low wears — and the clearest case for not owning at all.
HURR
hurr.coA UK rental platform for designer and premium pieces, lending both from brands and from other people's wardrobes. Useful when the alternative is buying something expensive for a single afternoon.
Who it's for Occasion and designer wear you'd otherwise buy once.
By Rotation
byrotation.comA peer-to-peer rental app where members lend their own clothes to each other. It has a community feel closer to a social network than a shop, and the range reflects what real people own.
Who it's for Anyone who likes the social side of borrowing rather than buying.
3 · Buy & sell pre-loved
Second-hand does two jobs at once: it finds a home for what you no longer wear, and it meets a need without anything new being made. WRAP measured in 2025 that buying pre-loved replaces a new purchase around 65% of the time — the first hard evidence that resale genuinely displaces production rather than adding to it.
Vinted
vinted.co.ukA large second-hand marketplace with no seller fees, which makes it the least friction-heavy way to move things on. Strongest for everyday clothing, kidswear and volume clear-outs.
Who it's for Clearing out, and everyday second-hand shopping.
Depop
depop.comA resale platform with a strong following for vintage and individual style, browsed more like a feed than a catalogue. Better than Vinted if what you're selling has a look to it.
Who it's for Vintage, distinctive pieces and building a selling presence.
4 · Research before you buy
Sometimes you do need something new. Boots that fit. A coat that lasts. This is the point at which who made it, and how, starts to matter.
Good On You
goodonyou.ecoIndependent sustainability ratings for thousands of fashion brands, scored on their impact on people, the planet and animals. It won't tell you what to buy, but it will tell you what a brand has and hasn't published — which is usually the more revealing question.
Who it's for Checking a brand before you spend.
We keep our own brand directory too — 60+ brands researched for materials, supply-chain transparency, labour practices and UK manufacturing, alongside repair, rental and resale platforms. Free for everyone, no app needed.
Sustainable Fashion Week 2026
All four of these are habits rather than purchases, and habits are easier started alongside other people. That's much of the point of Sustainable Fashion Week, run by A Single Thread — a week of swaps, repairs and workshops across the UK each autumn.
We run free clothes swaps in Doncaster as part of it. Bring what you don't wear, leave with something you will — five tickets each, plus one more for every item you bring, up to ten. No money changes hands.
- Sat 26 September, 10am–1pm — Doncaster Unitarian Church, 60 Hall Gate. Part of SFW26, with denim upcycling and a mending table.
- Sat 3 October, 11am–2pm — Danum Gallery, Library & Museum (DGLAM), Paddington Room. Part of SFW26.
- Sat 21 November, 11am–2pm — DGLAM, Paddington Room. Our own autumn swap.
- Sat 12 December, 11am–2pm — DGLAM, Paddington Room. Our own winter swap.
Free tickets and full details are on the homepage.
Buy less, choose well, use what you own. The apps are only there to make it easier.
Common questions
What's the most sustainable fashion app?
The one that helps you avoid buying something. No app is more sustainable than wearing what you already own, so a wardrobe app that styles outfits from your existing clothes does more good than any shopping app — however ethical the shop. After that, rental and resale apps both keep garments in use rather than making new ones.
What's the best app to sell clothes?
Vinted and Depop are the two most widely used in the UK. Vinted is generally the simpler route for everyday clothing, while Depop has a stronger following for vintage and distinctive pieces. Which suits you depends more on what you're selling than on the apps themselves.
Are there free sustainable fashion apps?
Yes. Closet Remix has a free tier with no time limit, and the resale apps are free to browse and list. Good On You's brand ratings are free to read. Rental apps are free to install, though renting itself is paid.
Start with what you own. Free on the App Store and Google Play — your wardrobe stays on your device.
Get Closet Remix